Here's why:
* Photosynthesis: The foundation of most food chains on Earth is photosynthesis. Plants, algae, and some bacteria use sunlight to convert carbon dioxide and water into sugars (glucose), storing energy in chemical bonds. This process is the primary way energy from the Sun enters the biosphere.
* Food Chain: Animals eat plants or other animals that have eaten plants, obtaining the energy stored in those organisms. This energy ultimately originated from the Sun.
* Fossil Fuels: Even fossil fuels, like coal, oil, and natural gas, are derived from ancient organic matter (plants and animals) that originally captured energy from the Sun through photosynthesis. When we burn these fuels, we release the stored energy back into the environment.
While there are a few exceptions, like organisms that live in deep ocean vents and derive energy from chemical reactions, the vast majority of life on Earth relies on energy from the Sun.
